Key making use of the properties of a liquid crystal
US5043710A · kind A · utility
14Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1989 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | Jun 5, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/962
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A touch sensor comprises a liquid crystal cell (10) and detector means (40, 50A, 50B) responsive to a change in the dielectric constant of the liquid crystal. The detector means comprise an HF electrical signal generator (40) together with integration means (50A, 50B) suitable for integrating the charge created by any change in the dielectric constant of the liquid crystal (14).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.